import time
from tqdm import tqdm

alist = list('letters')
bar = tqdm(alist)
for letter in bar:
    time.sleep(0.5)
    bar.set_description(f"Now get {letter}")

pbar = tqdm(["a", "b", "c", "d"])
for char in pbar:
    time.sleep(0.5)
    pbar.set_description("Processing %s" % char)